612 ITU‐T's Technical Reports and Specifications Radio relay (also known as fixed point‐to‐point radio link) Radio relays operate in frequency bands that typically range from 1.4 GHz up to 86 GHz and beyond. The most common antenna type is a parabolic dish antenna characterized by high directivity and low radiation outside the main beam direction. Radio relays generally operate in line of sight and are therefore installed so that the radio path is inaccessible by the general public. The distance in front of the dish antenna to the EMF exposure compliance boundary can range from centimetres to metres depending on the transmitter power used, antenna dimensions and gain. It is recommended that the compliance distance be assessed either by measurement or calculation as part of the site safety assessment. If the antenna is accessible, workers should never step in front of the dish up to the EMF exposure boundary to ensure compliance with the safety guidelines, and also because it will interrupt radio link. Source: Adapted from GSMA and MMF (2008). Figure 13 – Examples of typical worker compliance zones for a range of antenna installations used for mobile networks The shape of the compliance boundary in the diagrams above is very simplified and tends to overestimate the likely real exposure levels as it does not take account of the antenna radiation pattern. In practice, simplified or more complex diagrams may be used depending on regulatory or national practice approaches. It is important that the zones are clear to persons who may be using the diagrams. 4.6 Compliance for wireless devices Low power wireless devices include mobile phones, tablets, wireless sensors and supporting infrastructure such as wireless access points. In general, these devices will be designed and tested